Be sure not to overmeasure the amount of pineapple and grated carrot in this recipe or your cake could get soggy and/or crumbly. I made the mistake once of adding more pineapple and it ruined the cake.
Also, use the large side of the grater, and only lightly pack the grated carrot to fill 1 1/2 cups. Finely grated carrot will also introduce too much moisture into the cake.